Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/08—Artificial teeth; Making same
  • A61C13/082—Cosmetic aspects, e.g. inlays; Determination of the colour
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
  • A61K6/65—Dyes
  • A61K6/66—Photochromic dyes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
  • A61K6/65—Dyes
  • A61K6/68—Thermochromic dyes

Definitions

• the present invention relates to a method of coloring medical prostheses and a device for its implementation. It is frequent, even obligatory, in the field of medical prostheses, and in particular dental prostheses, fixed or mobile, whatever their method of production, to produce a coloration to match them with their environment.
• Each shade corresponds to a ceramic powder or a resin, obtaining the final color resulting from a judicious choice of these dyes.
• the ceramist uses, in addition to the coloring powders, successive layers of transparent thickness disposed between the dye and the surface of the tooth.
• the practitioner must successively place a layer of metal, a covering layer thereof which is opaque, a layer of dye, a layer of transparent material and a layer of surface varnish.
• the present invention aims to remedy these drawbacks by providing a coloring process of simple design, of rapid implementation and giving excellent results, making it possible to give a prosthesis and in particular a dental prosthesis, a color in harmony with its environment.
• the method which it relates to consists in including, in the mass of the prosthesis or on the surface thereof, at least one type of photo- or thermochromic pigments, then in projecting a beam onto the prosthesis focused or not, of a nature adapted to that of the pigments so as to make them react.
• the projected beam can be a light, caloric or other type of radiation such as X-rays.
• This technique makes it possible to have only one prosthetic material or mechanical reconstruction, integrating the coloring system and to create ef f and colors a posteriori after manufacture of the part.
• This technique makes it possible to make the color natural at any point of the material by playing on the focusing or defocusing of the beam, which avoids constructions in successive layers.
• This natural aspect of the coloring results in particular from the progressive defocusing of the beam naturally at the edge of the edge, which avoids sudden breaks.
• each type of pigments is of irreversible coloring.
• each type of pigments is of reversible coloring, which allows, when the shade obtained after emission of one or more beams, is not satisfactory, to return to the initial state by emission of a new beam.
• this method consists in carrying out an operation for fixing the coloring of the pigments.
• This fixing of the coloring of the pigments can be obtained by sending a beam to the prosthesis, by an electrical method such as iontophoresis or electrophoresis, or even by chemical reaction after depositing a fixing substance on the surface of the prosthesis.
• This fixing can take place by liberating radicals or by making active molecules capable of fixing themselves on the pigments and preventing them from returning to their initial state, which ensures the maintenance of the coloring.
• the beam projected onto the prosthesis to react the pigments can be a beam of non-coherent light, this beam passing through filters, for example mounted on a barrel, these filters being of color corresponding to the absorption bands of each pigment.
• an overall brown shade will be obtained by a beam very absorbed by photo-chromium pigments, as are, for example, silver halides.
• photo-chromium pigments as are, for example, silver halides.
• Other pigments reacting by giving blue colors make it possible to obtain a particularly advantageous transparency effect in the case of dental prostheses, in particular in the areas corresponding to the edges of the teeth.
• a device for implementing this method comprises at least one source for emitting a beam, and an optical system for focusing with adjustable position.
• the emission source is mounted in place of the tool-holder spindle of a numerically controlled machine tool, the prosthesis being, for its part, fixed on a machining support. It is also possible to take advantage of the tool-holder spindle of a machine tool by fixing on it a transmission head which is connected by an optical fiber to the emission source.
• this device comprises a computer knowing the general shape of the prosthesis to be colored, the nature of the pigments and the reactivity thereof, the sources of beam emission, the latitudes of movement of the focusing system. , and a device for analyzing the color of the prosthesis, the calculator controlling, _ on the basis of the information of the shade to be obtained and following the coloring operation, the selection of emission of the beams from the different sources, the control of the focus, and the fixing of the shade when the desired shade is reached.
• Figure 1 is a view of a block diagram representative of a dispo ⁇ device
• Figure 2 is a view of a first optical system
• Figure 5 is a schematic view showing a defocus operation during transmission
• Figure 6 is a view of an assembly of an emission source on a three-axis robot
• Figures 7 and 8 are two views describing the mounting of a transmission head on the tool holder of a machine tool
• FIG. 9 is a view of an example of reaction of a pigment.
• FIG. 1 represents a device for coloring a prosthesis 2 in the mass or on the surface of which there are photo ⁇ sensitive pigments 3.
• the light emission is carried out from several sources specific to each pigment to be colored, with the interposition of a source selection system 5 and a focusing system 6.
• This device comprises a system 7 for analyzing the color of the teeth adjacent to the prosthesis, if it is a dental prosthesis, the color of the neighboring teeth constituting the reference color to be obtained.
• This analysis device is connected to a block 8, 9 for calculating colors which gives information to a color geography system 10, controlling, on the one hand, the generator 12 equipped with the sources and, on the other hand, the block 13 for controlling the focusing system 6.
• This device also includes a 1- + control system acting on the color geography block 10 to monitor the emission of the different light beams and on the block 15 selecting a beam ensuring the fixation of pigments in the situation in which they are when the color obtained corresponds to
• FIG. 2 represents a dental prosthesis 16 containing colored pigments, on which exposure is made from a light source 17 equipped with an IS power dimmer, the beam emitted by the source being reflected by a prism 19 on a focusing system
• the displacement of the focusing system 20 makes it possible to carry out a defocusing allowing a shade of the coloring of the pigments.
• the source 18a is a non-coherent light source emitting a beam capable of passing through filters 22 which, mounted in a barrel 23, disposed between the source and the focusing system, are of color corresponding to the absorption bands of each pigment.
• the prosthesis 16 is mounted at one end of a fixing arm 26, the beam being constituted by a laser source 27 mounted on a three-axis robot driven by motors 28, 29 and 30 in three crossed directions.
• FIG. 7 represents a magazine 32 of tools 33 used by a numerically controlled machine tool for machining a prosthesis.
• a head 3 for transmitting a beam connected by an optical fiber 35 to a source 36.
• This head 3 can, like the tools 33, be fixed to the tool-holder spindle 37 of the numerically controlled machine tool.
• FIG. 9 shows, by way of example, a coloration process.
• An uncolored pigment in state A changes color under the action of radiation by modifying its molecular structure and is in state B.
• the pigment Under the action of another radiation, and by association of a stabilization molecule C, the pigment can be brought into a state D where it is both colored and stable.
• the invention brings a great improvement to the existing technique by providing a method and a device for coloring medical prostheses, and in particular dental prostheses, of simple design, of rapid implementation and allowing '' obtain the desired color nuances.
• the invention is not limited to the sole mode of implementing this method, nor to the sole embodiments of this device, described above by way of example: it embraces, cons milk, all variants.

Landscapes

• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dentistry (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Dental Prosthetics (AREA)

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Applications Claiming Priority (2)

Publications (2)

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ID=9379105

Family Applications (1)

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Family Cites Families (3)

• 1989
  • 1989-02-16 FR FR8902449A patent/FR2642959B1/fr not_active Expired - Lifetime
• 1990
  • 1990-06-29 WO PCT/FR1990/000489 patent/WO1992000056A1/fr active IP Right Grant
  • 1990-06-29 DE DE69019991T patent/DE69019991T2/de not_active Expired - Fee Related
  • 1990-06-29 EP EP90910768A patent/EP0538250B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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